Double-acting doorcheck



Dec. 16, w22@ 1,519,584

H. C. KREIFKE DOUBLE ACT INGv DOORCHECK Filed April 17, 1924 gg j Patented Dec. 16, 1924.

orties PATENTE' HERMAN C. KREIKE, 01T LOS ANGELES, CALIFORNIA.

DOUBLE-ACTNG: DORCHECK.

Application filed April 17, 1924. Serial No. 707,127.

To @ZZ whom t may concern.'

Be it known that l, HERMAN C. Knnrrnn, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented newl and #useful Improvements in Double-Acting Doorchecks, of which the following is a specification.

This invention relates to double acting door checks.

An object is to make a door check for swinging doors which will automatically hold a swinging door open either way, and which will automatically hold a swinging door yieldingly closed.

Another object is to make a door check having an air dash pot, a. dash pot piston in the dash pot, and a. restoring spring in opposition to the air in the dash pot, to mount the. dash pot on a door and to provide a crank and gear connection between the dash pot on the door and a part of the door frame.

Other objects and advantages will appear vtrom the drawings and specification.

y1`he drawings illustrate the invention and its application and use.

Figure 1 is a horizontal fragmentary sectional detail through a door and door frame and showing a double acting door check embodying the principles of my invention in use, the view being taken onv the line 1-1 ol' Fig. 2, and looking downwardly as indicated by the arrows.

Fig. 2 is a fragmentary sectional elevation on the line 2 2 of Fig. 1 and looking in the direction indicated by the arrows.

Fig. 3 is a fragmentary diagrammatic plan view showing in full lines the door held wide open one way, in dotted lines the door held closed, and in second dotted lines the door held wide open the other way, by the use of my invention.

Referring lirst to F ig. 2, the door 1 is mounted in thedoor opening 2 in the door frame 3, and is adapted to swing both ways from its closed position upon the pintle 4 fixed in a vertical position and connecting the door to the horizontal rail 5 of the door trame and the pintle 6 mounted in vertical alinement with the pintle 4 and connecting the door to the floor part 7 of 'the door frame. An attaching plate 8 is recessed into the iioor C? and secured in place by screws 9, and has an upwardly extending spacing hub 10. The segmental gear 11 is mounted upon the upper tace of the hub and held in place by screws 12. ylfhe post 13 is fixed in the plate 8 and has an enlarged portion 14 fitting in the hub at the axial center of the gear 11 and forming a shoulder 15 at its upper end and the: pint-le 6 extends upwardl)Y 'from the shoulder.

A. recess 16 is formed by cutting away the lower corner of the door 1 for a considerable distance longitudinally, a housing plate comprising a. bottom 17, sides 18 and 19, and an end 20, covers the recess 16 and is rigidly secured in place by screws 21, 22 and 23. The pintle 6 entends through the bottom 17 and the upper end oi? the pintle is screw threaded and a washer and nut is applied above the bottoni 1T to make a loose connection so that the door will swing freely. A hearing bracket 24 has a main portion parallel with the bottom 17 and a downwardly turned portion .itting against the inner tace oi' the end 2O and secured in place by bolts or rivets A crank shaft 26 is mounted rotatably through the bracket 24 and l through the bottom 17 and a spur pinion Q7 fixed upon the lower end oit the. crank shaft 26 against the lower tace of the bottom 17 in mesh with the segmental gear 11. pitman or link 28 is mounted upon the crank 29 oft' the crank shaft 26.

A dash pot cylinder 30 has heads 31 and 532 mounted upon the. upper tace of the bottom 1T and secured .in place by screws and 34, an intake check valve construction is mounted in and through the head 32, a dash pot piston is mounted in the cylinder 30, and a. piston rod or stem 37 entends from the pist-on 8G slidingly throi'lgh the head and is .connected to the pitman 28 by pivot pinv 8S. An expansion spring 39 is n'iounted in the cylinder 30 between the piston 3G and the head B1. The dash pot chamber 4() between the piston and the head 32 is adapted to take iu air through the check valve 35 when the piston 36 is moved away from the head 32, and the teusion of the spring 39 is exerted in opposition to the pressure o1' the air in the chambei' 40 when the piston 36 is: released, and provision may be made ttor the surplus air pressure escaping trom the chamber 40 by leaking around the piston 36 or in any other suitable way, as by a small port 41. A similar port 42 is Jformed through the head 31 to allow the air to es pe 'from the chainber 43 in which the spi g 39 operates.

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Referring to Fig. l, when the door is in closed position the crank 29, the pitman 28, the piston rod 37 and the door l are all in a straight line at right angles to the face 44 of the side frame 3 and the walls 45 and 46 extend both ways from the frame 40 will form a resistance to prevent the doorv from slamming or quick action.

When it is desired to hold the door wide open one way, as shown in 'lull lines in Fig. 3, the crank shaft 26 carrying the crank 29 is operated by the pinion 27 engaging the segmental gear l1, the pinion 27 rotating in the direction indicated by the arrow 47 until the crank 29 passes the dead center and then the tension of the spring 39 pulling upon the crank 29 will swing the kdoor wide open against the wall and hold it in that position until the door is manually moved to swing the crank 29 backwardly past lthe dead center. In a like manner, when the door is swung wide open in the opposite direction as indicated in dotted lines in F ig. 3, the pinion 27 will be rotated in the opposite direction as indicated by the arrow 48 until the crank 29 passes the dead center and the tension of the spring 39 will hold the door wide open in this position, the door pressing against the wall 46. When the door is swung from either wide open position until the crank 29 passes the dead center in the direction opposite to the arrows 47 and 48, the tension of the spring 39 will swing the door to its closed position as shown in Fig" 1, and as shown in the dotted lines 49 in Fig. 3.

The door frame side 3u is in opposition to the side 3 and the door opening 2 is between the frame sides 3 and 3a. If the door opening 50 happens to be some distance 'from a wall, of course there would be no walls 45 and 46 for the door to swing against when opened.

The sides 18 and 19 are bulged outwardly to form the housing members 18a and 19a at opposite sides of the gearsand as required t0 allow the crank shaft 26 to rotate. When the walls 45 and 46 are not present, the door may swing open either way until the housings 13a or i921 strike theface 44 of the frame side 3 and the tension will hold the door openy the same as though the door was swinging against a wall 45 o-r 46 or some other stop.'

wWhile I have shown the details of one complete and satisfactory double acting door check and its operation, it is obvious that various changes may be made'iwithout departing from the spirit of theinvention as set up in the following claims.

I claim:

l. The combination with a door frame and a door mounted in the frame and adapted to swing wide open in either or both directions, of a double acting door check comprising a dash pot cylinder adapted to be mounted on a door, a dash pot piston in the cylinder, a spring pressing the dash pot piston against the pressure in the cylinder, a stem for operating the dash pot, piston, a crank connected to the stem, a spur gear upon the crank, and a segment of spur gear adapted to be lixed to the door frame concentric to the axis upon which the door swung wide open either way the tension of the spring pulling upon the crank will hold the doorrwide open.

2. A double acting door check comprising a dashy pot cylinder adapted to'be mounted on a door, a dash pot piston in the cylinder, a spring'pressing the dash pot piston against the pressure in the cylinder, a stem for operating the dash pot piston, a crank connected to the stem a spur gear upon the crank, and a segment ospur gear adapted to be iixed to the door frame concentric to the axis upon which the door swings andy meshing with the spur gear upon the crank. In testimony whereof I have signed my name to this specification.

HERMAN QKREIPKE.. 

